I bought the Wunderlich tank bag that fits the R and RR, it worked out really well and held a lot of the little crap that I needed easy access to. (DSLR, phone, wallet, gopro batteries and charger, USB cords, tire gauge, spare change, etc). I also wear a Kriega R30 pack daily, so I'm really used to wearing it, but all I really had in it was water in the hydrapak, a couple of changes of socks, t-shirts, boxers and my windstopper fleece when I wasn't wearing it.
This bike doesn't have a lot of room for luggage but there are lots of ways to be creative with soft luggage these days, and I was staying in hotels so the luggage wasn't a worry.
Hwy 1 between the coast and Leggett is insane fun but not much for scenery (though the forest is neat). Overall my favorite road was the 89/108 coming back from Tahoe. 89 has some fun bits and mellow bits, but then you get on 108 and it's sensory overload, so many amazing things to look at, yet the road is so awesome you can't divide your attention between them!